Hudson commented on YARN-2730:

FAILURE: Integrated in Hadoop-trunk-Commit #6425 (See 
YARN-2730. DefaultContainerExecutor runs only one localizer at a time. 
Contributed by Siqi Li (jlowe: rev 6157ace5475fff8d2513fd3cd99134b532b0b406)
* hadoop-yarn-project/CHANGES.txt

> DefaultContainerExecutor runs only one localizer at a time
> ----------------------------------------------------------
>                 Key: YARN-2730
>                 URL: https://issues.apache.org/jira/browse/YARN-2730
>             Project: Hadoop YARN
>          Issue Type: Bug
>    Affects Versions: 2.4.0
>            Reporter: Siqi Li
>            Assignee: Siqi Li
>            Priority: Critical
>         Attachments: YARN-2730.v1.patch, YARN-2730.v2.patch, 
> YARN-2730.v3.patch
> We are seeing that when one of the localizerRunner stuck, the rest of the 
> localizerRunners are blocked. We should remove the synchronized modifier.
> The synchronized modifier appears to have been added by 
> https://issues.apache.org/jira/browse/MAPREDUCE-3537
> It could be removed if Localizer doesn't depend on current directory

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